Rule 500GPH Electronic Sensing Bilge Pump - 12V [25SA] Bags Fishing Gear C/C: 1 9/16" (40mm)

C/C: 1 9/16" (40mm)

For boats with narrow or uneven gunnels

Foam gasket

Working Load - 6173 Lbs (2800 kg)

Rule 500GPH Electronic Sensing Bilge Pump - 12V [25SA] Bags Fishing Gear C/C: 1 9/16" (40mm)500GPH Electronic Sensing Bilge Pump 12V In the next generation sensing bilge pumps, the 500GPH S series pump works on the principle of impeller resistance. The pump will turn on every 2 1 2 minutes for about one second to sense for water. If water is present, the pump will sense resistance and continue to run until all water is removed. After that, it will resume checking for water every 2 1 2 minutes. Water is kept in check between 1 8" and 3 8"!!!